The high salty dye waste water can be treated by nanofiltration.The salt concentration has an important influence on the nanofiltration process.  

Simulate the treatment of salty dye waste water by ceramic membrane nanofiltration in this paper. The dye (methyl orange, neutral red and basic fuchsin) solution 100 mg/L, mixed different sodium salt concentration (mass fraction is 0.05%, 0.1%, 0.5%, 1%, 5%, 10%) were prepared for nanofiltration. 

The effects of salt concentration on the retention rate, permeation flux and salt retention rate were investigated. The experimental results show that with the increase of salt concentration, the retention of dye decreases and the flux increases under low salt conditions. When the salt concentration increases to the high salt (1 %), the retention rate increases and the flux decreases.

The influence of salt concentration on membrane fouling was investigated. The membrane resistance of nanofiltration process was analyzed. It was found that the increase of salt concentration would reduce membrane resistance and membrane fouling.

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